The Common Collared Lizard, Crotaphytus Collaris, On A Rock Formation At The Dallas City Zoo In Texas. Stock Photo

Pictured is he common collared lizard, Crotaphytus collaris, on a rock formation at the Dallas City Zoo in Texas. It is also called eastern collared lizard, Oklahoma collared lizard, yellow-headed collared lizard and collared lizard. The collared lizard is the state reptile of Oklahoma, where it is known as the mountain boomer. Collared lizards can run on their hind legs, and are relatively fast sprinters. Record speeds have been around 16 miles per hour.